Which method uses hot air with no moisture?

Which method uses hot air with no moisture?

• A. Steam sterilization
• B. Chemical vapor sterilization
• C. Dry heat sterilization
• D. Ethylene oxide sterilization

Answer: (C)

Dry heat sterilization uses hot air with no moisture. Without water vapor to carry heat, heat moves more slowly into materials, so higher temperatures and longer exposure times are needed to achieve the same level of microbial kill. This makes it suitable for items that could be damaged by moisture, such as certain metals, glassware, oils, and powders. In contrast, steam sterilization relies on moist heat, where steam quickly transfers heat and denatures proteins, allowing effective sterilization at lower temperatures and shorter times. Ethylene oxide and chemical vapor sterilization use gases or vapors under pressure rather than hot air, so they do not fit the “hot air with no moisture” method.

Dry heat sterilization uses hot air with no moisture. Without water vapor to carry heat, heat moves more slowly into materials, so higher temperatures and longer exposure times are needed to achieve the same level of microbial kill. This makes it suitable for items that could be damaged by moisture, such as certain metals, glassware, oils, and powders. In contrast, steam sterilization relies on moist heat, where steam quickly transfers heat and denatures proteins, allowing effective sterilization at lower temperatures and shorter times. Ethylene oxide and chemical vapor sterilization use gases or vapors under pressure rather than hot air, so they do not fit the “hot air with no moisture” method.